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 <h1>INSTANCE ATTRIBUTES, PARAMETRIZED SUBCIRCUITS</h1>

 <h3 style="text-align:left; max-width: 55%;margin-left:0;">
  <ul style="margin-left:0;">
   <li>A symbol may have any sort of parameters that can be specified when placing an instance of it in a schematic.</li>
   <li>Example: inverter with variable W/L dimensions for p and n transistors.</li>
   <li>Parameters enable circuit reuse (think of variable width registers, variable size RAMs, variable strength buffers).</li>
   <li>Symbol may show parameters using the @param notation, @param is then expanded with the actual 'param' value
       set as attribute in the component instance.</li>
   <li>Attributes may be used in multiple level hierarchies. No single-level restriction.</li>

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